Pyrazolines IX. Chemistry of some 3-cyano-3-carbomethoxy-1-pyrazolines
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Product and kinetic studies have been made on the pyrolysis of a series of 3-cyano-3-carbomethoxy-1-pyrazolines substituted at C-4 with a methyl and an aryl group (phenyl, p-methoxyphenyl, and p-nitrophenyl). Evidence is presented supporting a transition state structure in which little progress to bond breaking of the C-5 to N bond has taken place at the transition state. The product distribution is largely dependent on the stereochemistry of the initial pyrazoline and to a lesser degree on the nature of the aryl group at C-4. The cis pyrazolines gave products resulting primarily from aryl migration while the trans pyrazolines gave products predominantly from methyl migration.
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1996 ◽
Vol 2
(3-4)
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pp. 62-69
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2008 ◽
Vol 383
(1)
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pp. 224-237
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2000 ◽
Vol 97
(4)
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pp. 1525-1529
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1989 ◽
pp. 1881
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2015 ◽
Vol 36
(5)
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pp. 1405-1410
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1971 ◽
Vol 93
(8)
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pp. 2091-2093
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